EP1216121B1 - Safety razors - Google Patents

Safety razors Download PDF

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Publication number
EP1216121B1
EP1216121B1 EP00962732A EP00962732A EP1216121B1 EP 1216121 B1 EP1216121 B1 EP 1216121B1 EP 00962732 A EP00962732 A EP 00962732A EP 00962732 A EP00962732 A EP 00962732A EP 1216121 B1 EP1216121 B1 EP 1216121B1
Authority
EP
European Patent Office
Prior art keywords
blade
safety razor
blade unit
unit according
blades
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP00962732A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1216121A1 (en
Inventor
Bernard Gilder
Ian Saker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gillette Co LLC
Original Assignee
Gillette Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10861678&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1216121(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Gillette Co LLC filed Critical Gillette Co LLC
Priority to EP05075621A priority Critical patent/EP1586425B1/en
Priority to EP09075038A priority patent/EP2055450B8/en
Publication of EP1216121A1 publication Critical patent/EP1216121A1/en
Application granted granted Critical
Publication of EP1216121B1 publication Critical patent/EP1216121B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/40—Details or accessories
    • B26B21/4012—Housing details, e.g. for cartridges
    • B26B21/4025—Cap elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/08—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
    • B26B21/14—Safety razors with one or more blades arranged transversely to the handle
    • B26B21/22—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/08—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
    • B26B21/14—Safety razors with one or more blades arranged transversely to the handle
    • B26B21/22—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously
    • B26B21/222—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously with the blades moulded into, or attached to, a changeable unit
    • B26B21/227—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously with the blades moulded into, or attached to, a changeable unit with blades being resiliently mounted in the changeable unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/40—Details or accessories
    • B26B21/4012—Housing details, e.g. for cartridges
    • B26B21/4018—Guard elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/40—Details or accessories
    • B26B21/4012—Housing details, e.g. for cartridges
    • B26B21/4031—Housing details, e.g. for cartridges characterised by special geometric shaving parameters, e.g. blade span or exposure

Definitions

  • This invention is concerned with safety razors and more especially the invention is concerned with a safety razor blade unit in which there are two or more blades with substantially parallel sharpened edges disposed to contact the skin between a front guard surface and a rear cap surface as the blade unit is moved across the skin in the performance of a shaving stroke.
  • a safety razor blade unit can be mounted permanently on a handle with the intention that the entire razor should be discarded when the blade edges have become dulled.
  • a safety razor blade unit may be detachably mounted to a handle so that the blade unit can be replaced on the handle when the blades have lost the sharpness required for efficient shaving. Replaceable blade units are commonly referred to as shaving cartridges.
  • the blades are usually carried by a moulded plastics frame, and the blades can be supported to move within the frame, either independently of each other or in unison under forces imparted on the blades by the skin during shaving.
  • the frame of the blade unit can itself define the guard surface which contacts the skin immediately ahead of the blades and/or the cap surface which contacts the skin directly behind the blades during a shaving stroke, but the guard and/or the cap may comprise an additional element carried by the frame.
  • a guard element of elastomeric material e.g.
  • the blade unit cap includes a strip of material containing a shaving enhancement product, such as a lubricant which gradually leaches out of the strip material during shaving.
  • the level of comfort obtained with any given safety razor blade unit is influenced strongly by the so-called shaving geometry, which is the relative positioning of the skin contacting components.
  • Important parameters of the shaving geometry include the blade exposure which is the distance by which the tip of the blade edge projects above, or is retracted below, a plane which is tangential to the skin contacting parts next in front and next behind the blade edge, the blade tangent angle (also known as the blade shaving angle) which is the angle at which the plane of the blade is inclined to a plane which is tangential to the guard and the cap surfaces (the tangent plane), and the blade span which is the distance by which the blade edge is spaced from the skin contacting element immediately in front of the blade edge, as seen in a plane which is tangential to the blade edge and the skin contacting element in front of it.
  • the blade span of the or each blade after the forwardmost or primary blade will in general be the distance from the edge of that blade to the edge of the blade immediately in front of that blade. Thus, for these subsequent blades it is convenient to refer to the "inter-blade span”.
  • FIG. 1 Shown in Figure 1 is a graph plotting the results of a series of shaving trials performed in accordance with established shave test protocols and carried out with blade units having different blade spans, the blade span in mm being plotted on the abscissa and the "score", an indication of preference expressed by the persons involved in the trials, being plotted on the ordinate.
  • the dip 1 in the upper portion of the curve is not fully understood and is not believed to be of particular significance, but the graph provides a very strong indication that very acceptable shave comfort can be expected if the blade span is in the range of about 0.6 mm to about 1.5mm and that a blade span around 0.7mm is likely to be most beneficial.
  • the blade span to some extent at least determines the size of the skin bulge which forms naturally immediately in front of the blade edge as the blade unit is moved over the skin during shaving, and the size of the skin bulge has a strong influence on the drag characteristic. From a theoretical viewpoint, these considerations should apply equally to all blades in blade units having more than one blade.
  • EP-A-0259065 there is proposed a safety razor with two blades mounted in tandem in a frame at the head of the razor, the blades being carried on the bottom of the fame by respective leaf springs so that each blade can pivot back under shaving forces to increase the blade span and also increase the blade exposure, the span of each blade being variable between 0.1cm and 0.229cm. Rinsing is not mentioned.
  • a header tank 5 having a opening in the bottom wall 6 and an overflow outlet 7 at a predetermined height h of 185mm above the bottom wall is provided.
  • the blade unit 2 to be tested is mounted to the underside of the bottom wall at the opening therein and the frame of the blade unit 2 is sealed to the bottom wall 6 around the opening. Prior to mounting the blade unit 2 in place for testing, all flow paths by which fluid can flow through the blade unit, from top to bottom, except by passing between two blades, are closed off by filling with suitable stopping material.
  • the gap between the first blade and the guard is blocked (as satisfactory rinsing through the region is not generally a problem) and any gap between the final blade and the cap is blocked since any flow through this gap will not contribute to any material extent to the removal of shaving debris which collects principally in front of and beneath the blades.
  • Water is supplied to the open top of the header tank 5 at a sufficient flow rate for the header tank to fill to the level of the overflow outlet 7, and when water starts to flow from this overflow outlet, the water which flows out through the opening in the bottom wall and through the blade unit during a certain period of time, in particular 10 seconds, is collected in a container 8 and is then weighed on a balance 9.
  • the weight of water collected in the container is used to obtain a measure of the "wash through rate" in litres/min for the particular blade unit 2 being tested.
  • the test as described above is repeated but with the blade unit 2 replaced by a normalising plate having had cut therein a rectangular hole with a length equal to the length of the blades in the blade unit and a width equal to the distance between the sharpened edges of the first and the last blades in the blade unit.
  • wash through index is defined to be the value obtained by following the test procedure described above and by calculating the value by means of Equation (1).
  • wash through indices have been determined for several razor blade units which are currently marketed. It will be appreciated that a high wash through index means good inter-blade rinsability and a low wash through index is indicative of poor inter-blade rinsability. Also, with larger inter-blade spans it can be expected that a higher wash through index can be achieved, although increasing the inter-blade span will detract from other important shaving performance characteristics, such as comfort, as well as having the detrimental effect of making the blade unit as a whole larger. Shown graphically in Figure 3 are the results of the wash through index determinations, the wash through index being shown plotted against the average inter-blade span.
  • the average inter-blade span is the actual span or distance between the cutting edges of the two blades, and for blade units with three or more blades the average inter-blade span is the distance from the cutting edge of the first blade to the cutting edge of the final blade divided by the member of blades less 1.
  • the blade units tested are identified by the names under which they are marketed in the panel at the bottom of Figure 3, except that those referred to in the panel as "Embodiments 1 & 2" and "Embodiment 3" are blade units constructed in accordance with the present invention and have not been previously known or suggested.
  • the Asda Tri-Flex, Kai 3 and Mach 3 each have three blades, whereas the remainder have two blades.
  • a safety razor blade unit comprising a frame with a guard and a cap and three or more blades with spaced substantially parallel sharpened edges, wherein the blade span of the first blade is from 0.60 to 0.90 mm, the inter-blade spans between adjacent pairs of blades are substantially equal, the average inter-blade span is not greater than 1.25mm, and the wash through index (as hereinabove defined) of the blade unit is not less than 0.20.
  • the stipulated maximum average inter-blade span and minimum wash through index are depicted by dashed lines in Figure 3.
  • wash through index it is believed possible to achieve a wash through index of up to 0.35 and it is preferable for the wash through index to be at least 0.25. From a consideration of Figure 1 it is unlikely that an average span less than about 0.7mm would be beneficial, and the preferred range for the average inter-blade span is from 0.70 to 1.20mm.
  • Preferred embodiments of the invention have at least three blades and in such embodiments it is preferable for the individual inter-blade spans to be substantially equal. Especially good results have been observed with blade units having three blades with an average inter-blade span of 1.05 to 1.15mm, more precisely about 1.10mm, and a wash through index of more than 0.275, more especially above 0.30. In addition, it has been found possible for a four-bladed blade unit to be assembled without becoming unduly large, enabling enhanced closeness to be obtained whilst the specified preferred minimum wash through index of 0.25 is exceeded and a average inter-blade span less than 1.20mm ensures adequate comfort during shaving.
  • the blade span of the first or primary blade is less than the inter-blade spans, and the primary blade span may be substantially equal to about 0.7mm.
  • the blades are substantially planar metal strips having a width less than the average inter-blade span, and mounted on elongate supports which are narrower than, and do not protrude rearwardly of the rear edges of, the respective blade strips.
  • each blade support has the form of a bar with parallel front and rear faces, a bottom face perpendicular to the front and rear faces, and a top face which is inclined at an angle of 65° to 75° e.g.
  • the blades are preferably movable independently of each other and for this purpose the ends of the support bars can be guided in slots in the ends of the blade unit frame. Springs can be arranged to act on the blade support bars to urge the blade upwardly to a normal rest position.
  • the safety razor blade unit illustrated in Figures 4 and 5 is a shaving cartridge or at least part of a shaving cartridge which in use is mounted on a razor handle and is capable of pivoting about an axis disposed forwardly of the blades.
  • the blade unit includes a rectangular moulded plastics frame 10 with longitudinal front and rear members 11, 12 interconnected by frame ends 13.
  • the front member 11 carries a strip 14 of elastomeric material which may be moulded in situ and, as shown, has a series of upstanding parallel fins 15.
  • the guard strip may have other surface configurations, however, for example as described in US-A-5191712, WO 97/25190 and WO 97/33729, and the material of the elastomeric strip may be as mentioned in US Patent No. 5249361.
  • the front frame member 11 defines a backstop 16 which serves an important role in establishing certain parameters of the shaving geometry of the blade unit, and in particular the blade span S, of the first blade which is measured from the top rear edge 17 of the backstop 16.
  • the rear member 12 of the frame carries a lubricating strip 18 incorporating a lubricant which is leached out of the strip on contact with water.
  • the composition of the lubricating strip 18 may be as described in US Patent No. 5113585.
  • Mounted within the central opening of the frame are three blade assemblies providing first, second and third blades 19,20,21 with parallel forwardly directed cutting edges 24,25,26.
  • Each blade 19,20,21 consists of a substantially planar metal strip fixed, e.g.
  • the blade support bar 28 has parallel front and rear faces 30 and 31, a bottom face 32 which is perpendicular to the front and rear faces, and a top face 33 to which the blade is attached and which is forwardly and upwardly inclined, the angle between the front and top faces being about 67.5° so that the blade is inclined at an angle of about 22.5°.
  • the support bar 28 has downwardly directed legs 29 at its ends, these legs being slidably received in slots 35 formed in the inner faces of the frame ends 13. Springs 36 are positioned to act on the lower ends of the legs 29 and urge the blade support and blade upwardly to a normal rest position, the upward movement being limited by engagement of the blade with stop shoulders 37 formed on the frame ends 13.
  • the blades 19,20,21 are supported in the blade unit frame 10 for vertical movement independently of each other under the forces encountered during shaving.
  • the blade unit of Figures 4 and 5 differs in certain details, especially with regard to the form of the blade supports and the positioning of the blades as described in further detail below, the blade unit is generally similar to the blade units described in our previous patent applications Nos. WO 97/37819, WO 99/16591 and WO 99/16592, to which reference can be made for further information on the blade unit construction.
  • the support bars 28 are narrower than the blades they support and are confined within the width of the blades, this being an important contribution to achieving a wash through index value of at least 0.20 in accordance with the essential teaching of the present invention.
  • the support bars 28 position the blades 19,20,21 so that, in their normal rest positions when the blade edges lie substantially in a common plane, the cutting edge 24 of the first blade 19 is spaced from the rear edge 17 of the backstop 16 at a primary span S 1 of 0.7mm, the cutting edge 25 of the second blade 20 is spaced from that of the first blade at an inter-blade span S 2 of 1.11mm, and the cutting edge 26 of the third blade is spaced behind that of the second blade at an inter-blade span S 3 of 1.11mm.
  • the blade unit shown in Figures 6 and 7 is for the most part the same as that as Figures 4 and 5 and except as explained below can be taken to be as described above.
  • An enlarged lubricating strip 18 is provided which defines a much larger surface for contact with the skin during shaving to enhance lubricant delivery to the skin, and has a greater volume for holding more lubricant available to be discharged during the life of the blade unit.
  • the front-to-back width of the lubricating strip is more than three times the average inter- blade span.
  • the elastomeric strip 14 has five upstanding fins 15 rather than four and has a reinforcing insert 40.
  • the blade assemblies are unchanged and are disposed within the frame 10 of the blade unit at the same primary and inter-blade spans as mentioned in relation to the blade unit of Figures 4 and 5. Consequently, this blade unit features the same average inter-blade span and the same wash through index as that of Figures 4 and 5, and it is identified as Embodiment 2 on the chart of Figure 3.
  • a blade unit with four parallel blades is illustrated in Figure 8.
  • the guard has an elastomeric strip 14 with five fins 15 and a reinforcing insert 40.
  • the blade assemblies are the same as described above in connection with the earlier embodiments, and the fourth blade 22 is arranged so that its cutting edge 27 is spaced from that of the third blade at an inter-blade span S 4 .
  • the primary span S 1 is 0.70mm.
  • the wash through index of the blade unit of Figure 8 as determined by the method described hereinabove is 0.26.
  • the blade unit of Figure 8 is identified on the chart of Figure 3 as Embodiment 3.
  • blades 19,20,21 and 22 in the blade unit of Figure 8 could be positioned at uniform inter-blade spans of less than 1.18mm, such as at the same inter-blade span of 1.11mm as in the blade units of Figures 4-6.
  • the average inter-blade span in this order four blades can be accommodated while still achieving the desired rinsability, as shown by the wash through index measurements, and without the front-to-back overall width of the blade unit becoming unacceptably large.
  • the blade units embodying the invention will be carried on razor handles when used for shaving, and so as not to detract from the rinsability characteristics the razor handle, and in particular the connection between the handle and the blade unit, should be arranged so as not to impede flow of rinsing water through the blade unit.
  • Suitable forms of connection for attaching the particularly described blade units to a handle arc those described in the prior applications Nos. WO 97/37819 and WO 98/36880.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Dry Shavers And Clippers (AREA)
  • Cosmetics (AREA)
  • Sawing (AREA)
EP00962732A 1999-09-27 2000-09-26 Safety razors Revoked EP1216121B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05075621A EP1586425B1 (en) 1999-09-27 2000-09-26 Safety razors
EP09075038A EP2055450B8 (en) 1999-09-27 2000-09-26 Safety razors

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9922832 1999-09-27
GB9922832A GB2354474B8 (en) 1999-09-27 1999-09-27 Safety razors
PCT/GB2000/003690 WO2001023150A1 (en) 1999-09-27 2000-09-26 Safety razors

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP05075621A Division EP1586425B1 (en) 1999-09-27 2000-09-26 Safety razors

Publications (2)

Publication Number Publication Date
EP1216121A1 EP1216121A1 (en) 2002-06-26
EP1216121B1 true EP1216121B1 (en) 2005-06-01

Family

ID=10861678

Family Applications (3)

Application Number Title Priority Date Filing Date
EP00962732A Revoked EP1216121B1 (en) 1999-09-27 2000-09-26 Safety razors
EP09075038A Revoked EP2055450B8 (en) 1999-09-27 2000-09-26 Safety razors
EP05075621A Revoked EP1586425B1 (en) 1999-09-27 2000-09-26 Safety razors

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP09075038A Revoked EP2055450B8 (en) 1999-09-27 2000-09-26 Safety razors
EP05075621A Revoked EP1586425B1 (en) 1999-09-27 2000-09-26 Safety razors

Country Status (22)

Country Link
US (6) US20020144404A1 (enExample)
EP (3) EP1216121B1 (enExample)
JP (1) JP2003510142A (enExample)
KR (1) KR100736996B1 (enExample)
CN (2) CN1376105A (enExample)
AR (1) AR025732A1 (enExample)
AT (2) ATE296718T1 (enExample)
AU (1) AU774134B2 (enExample)
BR (1) BR0014324B1 (enExample)
CA (1) CA2383994C (enExample)
CO (1) CO5280125A1 (enExample)
DE (2) DE60041722D1 (enExample)
DK (1) DK1586425T3 (enExample)
ES (2) ES2239615T3 (enExample)
GB (1) GB2354474B8 (enExample)
IL (2) IL148473A0 (enExample)
MX (1) MXPA02003195A (enExample)
NZ (1) NZ517606A (enExample)
PT (1) PT1586425E (enExample)
TR (1) TR200200798T2 (enExample)
TW (1) TWM252529U (enExample)
WO (1) WO2001023150A1 (enExample)

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